受火后型钢混凝土框架结构抗震性能研究
发布时间：2018-11-27 06:37
【摘要】：为了给受火后型钢混凝土框架结构的性能评估及修复加固提供方法,进行了火灾后型钢混凝土框架结构的抗震性能研究。在ABAQUS平台上,采用梁单元,同时通过编制材料子程序和场变量子程序,建立了可进行型钢混凝土框架结构火灾升降温作用下的力学性能及受火后抗震性能分析的计算模型。利用该计算模型对火灾升降温作用下型钢混凝土框架结构的变形及内力进行了分析。同时,考虑起火层位置、受火时间等参数的影响,采用考虑升降温的火灾后静力非线性分析方法和动力弹塑性时程分析方法,对火灾后型钢混凝土框架结构的破坏形态、地震作用后结构承载能力、变形特征等抗震性能进行了参数分析。分析表明,火灾升降温过程中,由于结构升温的滞后性,构件的变形增长及恢复也滞后于火灾空气升降温过程,受火后构件有残余变形;针对火灾发生在某一层的火灾工况,受火后框架承受水平地震(静力)作用时,框架破坏机构出现在底部3~5层;当受火层位于底层时,受火后框架的水平地震作用后结构承载能力降低幅度最大,受火时间为180、300 min时降幅分别为8%、9%;受火层位置越低,框架顶部位移越大;随受火时间增加,框架顶部位移增大。
[Abstract]:In order to provide methods for performance evaluation and repair and reinforcement of steel reinforced concrete frame structure after fire, the seismic behavior of steel reinforced concrete frame structure after fire was studied. On the platform of ABAQUS, using beam element, material subroutine and field variable subroutine, the calculation model of mechanical properties and seismic behavior analysis of SRC frame structure under the action of fire rising and cooling is established. The deformation and internal force of SRC frame structure under the action of rising and cooling of fire are analyzed by using this model. At the same time, considering the location of fire layer and the influence of fire time and other parameters, the failure pattern of steel reinforced concrete frame structure after fire is analyzed by the nonlinear static analysis method and dynamic elastoplastic time history analysis method, which takes into account the rise and fall of fire temperature. The seismic properties such as the bearing capacity and deformation characteristics of the structure after earthquake are analyzed. The analysis shows that in the process of fire rising and cooling, because of the lag of structure heating, the deformation growth and recovery of components lag behind the process of rising and cooling of fire air, and there is residual deformation of the components after fire. When the frame is subjected to horizontal earthquake (static) after fire, the failure mechanism of the frame appears at the bottom of 3 layers. When the fire layer is located at the bottom of the frame, the bearing capacity of the frame decreases the most after the horizontal earthquake, when the fire time is 180300 min, the decrease is 8 / 9, respectively, and the lower the fire layer is, the greater the displacement of the top of the frame is. With the increase of fire time, the top displacement of frame increases.
【作者单位】： 中国建筑科学研究院;中电投工程研究检测评定中心;山东青年政治学院经济管理学院;
【基金】：国家自然科学基金项目(51778595,51278477) 北京市自然科学基金项目(8172052)
【分类号】：TU352.11;TU398.9
[Abstract]:In order to provide methods for performance evaluation and repair and reinforcement of steel reinforced concrete frame structure after fire, the seismic behavior of steel reinforced concrete frame structure after fire was studied. On the platform of ABAQUS, using beam element, material subroutine and field variable subroutine, the calculation model of mechanical properties and seismic behavior analysis of SRC frame structure under the action of fire rising and cooling is established. The deformation and internal force of SRC frame structure under the action of rising and cooling of fire are analyzed by using this model. At the same time, considering the location of fire layer and the influence of fire time and other parameters, the failure pattern of steel reinforced concrete frame structure after fire is analyzed by the nonlinear static analysis method and dynamic elastoplastic time history analysis method, which takes into account the rise and fall of fire temperature. The seismic properties such as the bearing capacity and deformation characteristics of the structure after earthquake are analyzed. The analysis shows that in the process of fire rising and cooling, because of the lag of structure heating, the deformation growth and recovery of components lag behind the process of rising and cooling of fire air, and there is residual deformation of the components after fire. When the frame is subjected to horizontal earthquake (static) after fire, the failure mechanism of the frame appears at the bottom of 3 layers. When the fire layer is located at the bottom of the frame, the bearing capacity of the frame decreases the most after the horizontal earthquake, when the fire time is 180300 min, the decrease is 8 / 9, respectively, and the lower the fire layer is, the greater the displacement of the top of the frame is. With the increase of fire time, the top displacement of frame increases.
【作者单位】： 中国建筑科学研究院;中电投工程研究检测评定中心;山东青年政治学院经济管理学院;
【基金】：国家自然科学基金项目(51778595,51278477) 北京市自然科学基金项目(8172052)
【分类号】：TU352.11;TU398.9
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